Fireproof door.



110.893,131. PATENTED JULY 14, 1908.

P. BOGIEJNBERGER-I FIRBPROOF DOOR. l 1

y APPLICATION FILED AUG. 24,1907.

z SHEETS-SHEET 1.

FRED BOGENBERGER, OF MILWAUKEE, WISCONSIN.

FIREPROQF DOOR.

Specification of Letters Patent.

, Patented July 14, 1908'.

Application filed August 24, 1907. Serial No. 390,056.

To all whom it may concern:

Be it known that I, FRED BOGNBERGER, a citizen of the United States, residing at Milwaukee, in the county of Milwaukee and State of Wisconsin, have invented certain new and useful Improvements in Fireproof Doors; and I do declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled inthe art to which it appertains to make and use the same.

This invention relates to iireproof doors and shutters.

The object of the invention is to provide al suitable covering for wooden doors and shutters which will be simple in construction, easily applied, and which will come within the re uirements of the lire insurance laws. These cors and shutters are constructed with awooden body or filler covered with tin plate or other sheet metal attached in such manner that it will not come off durin a fire. This covering has usually been app 'ed in sheets nailed to the woodthrough two adj acent edges only of each sheety and the nails then covered by a seam formed by a turnedup portion of the nailed edges, and locks on the unnailed edges of the adjacent sheets. The present insurance laws require that these sheets shall be nailed through all four edges of each sheet, and that these nails be covered with a strong seam of the same sheets, and it is to provide for'this requirement that applicants invention is designed.

In the accompanying drawings,-Figure 1 represents a front elevation of a door constructed in accordance with this invention; Fig. 2 represents a transverse section `taken on line 2-2 of Fig. 1, the upper side of the door shown in said figure showing the covering before the seams are attened and the under side thereof showing the seams flattened over the nails; Figs, 4, 5 and 6 show four styles of sheets made in four different sizes; Fig. 7 shows an enlarged detail of the seam before and after it is flattened.

In the embodimentr illustrated a wooden door l is shown having an approximately different sizes, 3 representing the full sized sheet, 4 a half sized sheet cut crosswise, 5 a half sized sheet cut lengthwise, and 6 a quarter sized sheet. Thus it will be seen that the area within the casing can always be worked up to a size that is a multiple of the smallest width and breadth of these different sized sheets. The casing 2 may be made also in variable widths to meet the requirements of different sized doors.

In covering the door the casing is made in four pieces stamped and nailed at the four corners.v The various sized sheets are then placed upon the door as indicatedv in Fig. 1. These sheets or panels are each provided with flanges extending laterally at right angles on one or more of its edges and on the other edges with U-shaped pockets having a laterally extending li the pockets of one sheet fitting over the flanges of the adjacent sheet with its lip overlapping said adjacent sheet and nailed all around through said lips. The pockets containin the flanges are hammered over covering alI the nails and making a thoroughly fire roof door, as shown in Fig. 7, in which one of) the plates is shown having an upwardly projecting flange 7, over which extends a U-shaped pocket 8 formed in the adjacent plate and having a laterally extending lip 9, whichoverla s the outer face of the plate carrying the ange 7 and through which, andsaid plate is passed a securing nail, 'as 10. The pocket 8 with the flange 7 therein is then bent down over' the head of the nail 10 .and hammered into position as shown at the right in Fig. 7.

As shown the top row of plates or panels is formed of the sheets 5 and 6. The corner sheet 6 has pockets 6aL arranged around all of its edges and said pockets are provided with lips 6b. The pockets at one side and the top of this sheet' 6 fit over the flanges 2a on the casing 2 at the corner of the door and those on the' other side and-bottom fit over .the anges yon the adjacent sheets 4 and 5, the pockets and flanges of the adjacent panels thus coact to securely unite their respective panels against the entrance of flame in case of fire. The sheets 5 are formed as shown in Fig. 6 with a flange 5a on one side edge and with the pockets 5b having laterally extending lips 5. The top pocket 5b of the sheet 5 fits over the flange 23L of the casing 2 and side pocket thereof fits over the flange5a of the adjacent sheet 5 and the bottom pocket over the top flange of the sheet 4 in the row below. The sheets 4 have a top flange 4a and pockets 4b arranged on its sides and bottom, said pockets each having a lip 4, as shown in Fig. 4. The sheets 3 have flanges 3a on its top and left side and pockets 3b on its bottom and right side, said pockets having lips 3C. The second row is composed of one sheet 4 arranged at the left thereof and three sheets 3. The third row consists of one plate or sheet 4 at the left and four sheets 3 connected therewith. The bottom or fourth row is formed the same as the second, of one sheet 4 and three sheets 3.

I claim as my invention:

1. In a fire door, the combination of a core or filler, a metallic casing for the edges thereof' seamed and nailed at the corners and having a laterally extending flange arranged around its inner edge, a plurality of metal sheets arranged on the faces of said filler within said edge casing, and having laterally extending flanges and pockets at their respective meeting edges for engagement with each other, each pocket having a lip extending in a plane parallel with the body of the pocket-carrying sheet and overlapping the body of the adjacent flange-carrying sheet,

and fastenings passing through said lip and flange-carrying sheet.

2. A iire door sheathing composed of a plurality of metallic sheets, each having a laterally extending flange on one edge and auother edge having a pocket provided with a lip extending in a plane parallel with the body of the sheet, said lip overlapping the face of the adjacent sheet, the edge of said adjacent sheet being provided with a laterally extending flange for projection into the pocket of the first mentioned sheet.

3. A fire door sheathing composed of an approximately U-shaped edge casing, having lateral lianges extending outwardly from its free edges,. and a plurality of metal sheets or panels arranged in said casing and having eo acting laterally extending flanges and lipcarrying pockets respectively on the adjacent edges of the sheets for engagement with said casing and with each other.

In testimony whereof I have hereunto set my hand in presence of two subscribing wit- HGSSQS.

FRED BOGENBERGER. Witnesses:

THEO. ERNST, F. BOGENBERGER, Jr. 

